Apparatus for measuring the amount of sebum secreted by the skin of a living subject
AssigneeL'oreal
InventorsPierre Bore, Lucienne Tourenq
Life of this patent
Estimating the term…
Abstract
Apparatus for measuring the secretions of sebum of a skin sample of a living subject comprises a frosted glass plate spring urged to project from a casing (using a calibrated spring). When pressed against the forehead of a living subject the frosted plate retracts yieldably to collect sebum under reproducible conditions. A reference scale inside the casing of the apparatus is illuminated from a known light source and is observed from outside by looking through the greasy plate. The sebum secretion is measured by changing the position of the scale, or changing the line thickness of a reference mark on the scale until a sharp, fine image of the reference mark can be seen.
Claims11
Apparatus for measuring the amount of sebum secreted by the skin of a living subject, said apparatus comprising:
- a casing having a side wall;
- a sample holder carried by said casing, means mounting said sample-holder relative to said casing for movement between an extended position and a retracted position in which it is flush with said casing;
- translucent means carried by said sample holder for application to the zone of skin to be studied, a calibrated spring urging said sample-holder into said extended position;
- a scale within the casing;
- reference means on said scale;
- and a light source within the casing for emitting a luminous flux toward said scale;
- so that the amount of sebum deposited on the sample-holder can be determined by observation of the reference mark of the scale through the translucent element.
Dependencies are inferred from the claim text.